JSRPC: Implement serialization of Blob.#6815
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Registers Blob as a serializable host type (new `blob` SerializationTag), so it can be passed over built-in JSRPC and cloned via structuredClone() / postMessage(), matching the spec which lists Blob as a serializable object. It is serialized as its MIME type followed by its raw bytes. The File subclass is intentionally left non-serializable.
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Merging this PR will degrade performance by 10.37%
|
| Benchmark | BASE |
HEAD |
Efficiency | |
|---|---|---|---|---|
| ❌ | Encode_ASCII_1024[TextEncoder][0/0/1024] |
3.3 ms | 3.7 ms | -10.37% |
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Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.
Comparing G4brym:blob-jsrpc-serialization (56beba5) with main (5be9cba)
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129 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩
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Makes
Blobserializable so it round-trips through JSRPC,structuredClone(), andpostMessage(), per the structured-clone spec. Serialized as MIME type + raw bytes.No new compat flag: this is net-new behavior (
Blobpreviously threw), not a breaking change, so it doesn't seem to warrant one, happy to add one if reviewers think otherwise.